方法挺多的,我选择一种比较简单的方法,其它方法参考该博主博文:https://blog.csdn.net/cunchi4221/article/details/107471069
使用Files类将文件读取为字符串:
1 package com.example.test;
2
3
4 import java.io.IOException;
5 import java.nio.file.Files;
6 import java.nio.file.Paths;
7
8
9 public class test {
10 public static void main(String[] args){
11 String FileName = "D:\test.txt";
12 String id = readUsingFiles(FileName);
13 System.out.println("This is ID:
" + id);
14 }
15 private static String readUsingFiles(String FileName) {
16 try {
17 return new String(Files.readAllBytes(Paths.get(FileName)));
18 } catch (IOException e) {
19 e.printStackTrace();
20 return null;
21 }
22 }
23 }